A loop of wire is oriented in the magnetic field as shown below (the plane of the loop is perpendicular to the direction of the magnetic field). Which of the following is true?
A) There will be an induced current only if the loop is moved to the left.
B) There will be an induced current only if the loop is moved to the right.
C) There will be an induced current only if the loop is moved upward.
D) There will be an induced current only if the loop is moved downward.
E) There will be an induced current if the loop is moved either up or down.

Question

A loop of wire is oriented in the magnetic field as shown below (the plane of the loop is perpendicular to the direction of the magnetic field). Which of the following is true? 
A) There will be an induced current only if the loop is moved to the left. 
B) There will be an induced current only if the loop is moved to the right. 
C) There will be an induced current only if the loop is moved upward. 
D) There will be an induced current only if the loop is moved downward. 
E) There will be an induced current if the loop is moved either up or down.

Quizplus · Accepted Answer

According to Faraday's law of electromagnetic induction, an induced EMF is generated in a conductor when it cuts magnetic field lines. The direction of the induced EMF is such that it opposes the change in flux. In this case, if the loop is moved upwards or downwards, it will cut the magnetic field lines and there will be a change in the flux. Therefore, an induced current will be produced in the loop, and the direction of the induced current will be such that it will oppose the change in flux. Hence, the correct answer is E.

A Loop of Wire Is Oriented in the Magnetic Field